Lever mechanism.



. F. J. HANRAHAN.

LEVER MECHANISM. I APPLICATION FILED JUNE 6, 1909.

Patented July 2, 1912.

. Kiw /QM NW W M/fli i dkmmqo FRANCIS J. HANRAHALT, OFR'UIPERT, PENNSYLVANLL.

LEVER MECHANISM.

Specification of Letters Patent.

ltntcntod July 75, 1912.

Application filed June 5, 1909. Serial No. 500,319.

To all whom it may concern:

Be it known that I, Fmiivois al. Harm).- HAN, a citizen of the United States, residing at Rupert, in the county of Columbia and State of Pennsylvania, have invented a new and usefulLever Mechanism, of which the following is a specification.

This invention has reference to improvements in lever mechanisms for engines and isdesigned more particularly to'incrcase the power'transmitted from the reciprocating piston rod of. the engine to the crank shaft. For this purpose there is provided a lever system by means of which the piston stroke may be increased and the expansive force of the steam utilized for a longer relative period than usual. t

' The invention will be best understood from a consideration of the following detail description taken in connection with the accompanying drawings forming a part of this specification, in which drawings,

Figure 1 is a side elevation ofthe improved engine in one phase of its operation. Fig. 2 is a similar view of the engine in another phase of'its operation. Fig. 3 is perspective view of one of the levers used in the connecting mechanism. F ig. 4 is a slide used in connection with the structure of Fig. 3.

Referring to the drawings there is shown a frame 1 constituting the frame of the engine and this frame may be mounted upon a bed 2 of any suitable construction. Near one end of the frame there is journaled a shaft 3 carrying at one end a fiy-wheel 4 and at the other end a crank disk 5, although of course the crank disk may be replaced by an ordinary crank. In the particular structure shown the shaft 3 carries at an intermediate point a pulley 6 but this arrangcment .of the parts may be varied at will. Near the other end of the frame 1 there is mounted a cylinder 7 with its usual steam chest 8 in which latter may be located the usual slide valve receiving motion from a pitman 9 connected-t0 a shaft 10 which is actuated by an eccentric 12, all these parts being of the usual construct-ion.

The piston rod of the engine, indicated at 13, is connected to the usual cross-head ll capable of sliding in guideways 15.

Erectcd on the frame 1 between the shaft 3 and the outer end of the guidcways if) is a standard 16 to which is pivotally connected a lever 17, the Pivot connection 18 of which stud 2i projecting from the standard l6.

This lever J0 is provided at the upper cud with a longitrn'linal slot 22 in which there is mounted a'hlock capable of sliding longitudinally in the slot and this block has a pin 24; projecting thcrciroiu through the lever l7 at an appropriate point then-on. The other or shorter end of the lever .20 is connected by a pitmau 25 to a crank pin 26 on the crank disk 5.

Let it he assumed that the fly-wheel l is rotating clockwise as viewed in Figs. 1 and 2 then the crank pin 26 may he assumed to he moving off dead center while the piston of the engine is at the rear of cylinder 7. As the piston moves forward the lever 17 is swung from the position shown in Fig. 1 toward the position shown in Fig. .2, moving for *ardly through an arc de:-;crihcd about the axis of the stud l8. he lever 17 is a lever of the second class and is connected at an intermediate point by means of the slide .23 to one end of the lever 20 which is the lover of the first class and the longer end of the lever 20 will move through the are described by the connection between the two lovers. This is more distant from the pivot point. 21 than is the. point of conncctimr of the pitman 25 with the other end of the lever 20.

(hmsidcring the resistance to the rotation of the shaft 3 as the load then less power may he applied to the lever 20 at the stud 21- to cause the rotation of the shaft than would be the case il the power were applied directly to the crank stud 26.

Since the connection between the lovers 17 and 20 is intermediate between the pivot stud 18 ot' the l-'-\ or '17 and the connection of the crank it) with said lover 1.7, the power necessary to moz'ithe lever 17 against the force rc.--'istin u' uch movement is less than the hlllll 'l'orco. t nscqiuintl v the power applied at the out r end of the lever l7 is materially less than lllt force applied at the crank pin or stud 12V to rotate the shaft 3.

Because of litl' increased movmucnt of the outer end of the lever 17 over and above the movement of the crank pin or stud 96,

'lll) the cylinder 7 may be made longer than though the cross-head 14 were directly connected to the crank p111 2G and the expansive force of the steam within the cylinder maybe exerted for a correspondingly longer period, thus permitting not; only a lower steam pressure for the initial steam pressure, but a longer stroke of the piston is available for the same movement of the crank pin upon the shaft What; is claimed is 1.. In a motor, a guideway, a member mounted for reciprocation therein, a standard fixed relative to the guideway, a crank, said standard being interposed between the crank and the guideway, a lever pivoted at one end to the standard, a pitman connected to the reciproeatory member and pivoted to the other end of the lever, both pivots being relatively fixed, a slide pivotally mounted upon the lever at a point between the ends thereof, the pivot for the slide being fixed with relation to the first mentioned pivots,

a lever fulcrumed upon the standard at av point between its ends and formed with a slot in which the slide reciprocates, the slot being located at one end of the last mentioned lever, and a pitinan having fixed pivotal connection with the last mentioned lever at its other end and connected to the crank.

2. In a motor, a crank, a guide, a crossard below and in line with the pivotal point o1 the first lever, a co-acti'ng and sliding p1v-.

otal connection between the upper end of the second lever and the first lever, said connection being intermediate of the ends of the -head mounted for reciprocation in said I first lever, and a pitman pivotally connected to the lower end of the second lever and the crank.

- In testimony that I claim the foregoing as my own, I. have hereto atlixed my signature in the presence of two witnesses.

FRANCIS J. I-IANRAIIAN.

Witnesses CHAS. 1G. RANDALL,

E. B. Gum. 

